Display screen with a graphical user interface



The single FIGURE is a front view of a display screen with a graphical user interface showing the claimed design.

The outermost broken lines, including the outer broken line showing of rounded shapes, illustrate an electronic device and form no part of the claimed design. The broken line at the perimeter of the figure illustrates a display screen and forms no part of the claimed design. The remaining broken lines, including the closely spaced broken lines showing text and icons, illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 